The ZX has a slight misfire on tick over & upto about 2 ~ 2.5K.
I personally think its overfueling, but I'm wondering if you guys have any ideas that I could try.
It has brand new plugs & runs a known good coil pack. The engine is a 1.4 Multipoint with the squared inlet manifold. The fuel rail was originally a ingle input one that I changed for one with a inlet & return, the latter being controlled by a vaccume valve.
I have read I'm sure that there is something on the inlet side that sticks or is prone to sticking??
When I initally got the engine stated, like a spanner I forgot to open the thermostat bleed valve > remembered every other one. & consiquently it over heated, in as much that the warning light came on. When I opened the valve, you can imagine it was like a small steam train & there were some ominus creaks & clonks from the engine. I've yet to do a compression check to see if I've buggered anything but it uses no oil or water & doesn't smoke at all. The engine also sounds sweet & revs freely.
So there you go thats the history, whats your ideas folks
TU3JP Question
Moderator: RichardW
Is it a regular misfire - i.e. it seems to be the same cylinder that misses now & then ?
This is most likely down to a faulty ignition lead/plug.
Or is it the general miss of a beat now & then (engine seems to hop a bit).
This is most likely to be an air leak in the manifold/throttle housing. Any place AFTER the sensors & injector. Could also be the dreaded MAP sensor teasing up.
This is most likely down to a faulty ignition lead/plug.
Or is it the general miss of a beat now & then (engine seems to hop a bit).
This is most likely to be an air leak in the manifold/throttle housing. Any place AFTER the sensors & injector. Could also be the dreaded MAP sensor teasing up.
Anders (DK) - '90 BX16Image
mmm well it seems to be a regular cycle like it has a beat to it if you see what I mean.
I disconnected each plug but the throttle housing & they didn't seem to make much difference except one which made the revs run high but I didn't leave it running long enough to see if the mis had gone.
The engine doesn't use igintion leads as it has a coil pack directly above the plugs - same idea as the 16v Xantias
I disconnected each plug but the throttle housing & they didn't seem to make much difference except one which made the revs run high but I didn't leave it running long enough to see if the mis had gone.
The engine doesn't use igintion leads as it has a coil pack directly above the plugs - same idea as the 16v Xantias
On the bottom of the throttle housing ("carburettor"). Its a sensor look-a-like.
Earlier types are small squarish units with separate small dia hosing connected - a MAF (manifold air flow) sensor. Barely matcbox size - but matchbox shaped black plastic units.
Both types gunk up with oil from the intake air - which also have the sump vent hoses attached.
Earlier types are small squarish units with separate small dia hosing connected - a MAF (manifold air flow) sensor. Barely matcbox size - but matchbox shaped black plastic units.
Both types gunk up with oil from the intake air - which also have the sump vent hoses attached.
Anders (DK) - '90 BX16Image
right a little update,
I have removed, dismanteled, cleaned & rebuilt all the bits surrounding the butterfly & its still the same.
I have added some more fuel - always check the obvious & its still the same.
I have found that if I remove the oil filler cap I get quite a draught out of there but if I put my hand over it I get some vaccume.
Any suggestions?
I have removed, dismanteled, cleaned & rebuilt all the bits surrounding the butterfly & its still the same.
I have added some more fuel - always check the obvious & its still the same.
I have found that if I remove the oil filler cap I get quite a draught out of there but if I put my hand over it I get some vaccume.
Any suggestions?
The MAP sensor is number 8 in that picture.rossnunn wrote:aah yeh I know it, no.7 in this pic:
http://www.citroen-pr.net/catalogues/il ... 40004D.gif